The organising committee of the 2020 Tokyo Olympics is considering reducing the spectator capacity of the sailing competition venue from the initial 5,000 spectators due to the potential risk of tsunami, committee sources said Wednesday.

In addition to spectators, some 3,000 personnel associated with the sport are expected to go to the facility in Kanagawa Prefecture, southwest of Tokyo, but it is still not clear how to evacuate all the people including many foreigners in the event of a disaster, prompting the organizing committee and others to start studying measures to ensure safety.

According to the Kanagawa government's initial plan presented to the prefectural assembly, some 5,000 spectators will be seated on the breakwater on the east side of Enoshima Island.